Sub help

khuntim · 2025-09-13T03:53:00-0700

I am not sure what changed, I used to be able to get different results with RoomFit just by changing the Sub from 0° to 180°, now regardless of sub position, sub polarity or crossover, always looks like this.

if I boost by 3db or so in the Sub settings it doesn't sound right. hoping to get back to something a bit closer with a bit of sub impact.

Speakers are Shanling S0 50hz-20khz, Sub is REL Tzero mkiii 37hz-? Crossover at 60hz. LFE input on sub. RoomFit 30-400hz. Using optical input, have tried USB and AUX.

The sub will not fit behind the TV, unless I figure out a different stand of some sort. floor and walls are concrete. I tried pulling the sub out a bit, can't have it in the walkway, that did nothing..

sub latency tested using all speaker inputs with the Ultra in listening position, Sub always leads the speakers by at least 3ms, up to 40ms using USB.

Microphone is Umik1 using iPad.

Ultra was factory reset after latest firmware.

rccarguy · 2025-09-13T04:18:06-0700

Don't apply boosts.
Test speakers and subwoofer seperately see how the response is
then compare with the both on, if each response changes a lot then they're cancelling and boosting each other out)
Try moving sub around room.

That's a massive room you need more than a tiny subwoofer, a couple of decent 10"/12" sealed boxes should be enough for music

khuntim · 2025-09-13T09:34:13-0700

rccarguy said:
Don't apply boosts.
Test speakers and subwoofer seperately see how the response is
then compare with the both on, if each response changes a lot then they're cancelling and boosting each other out)
Try moving sub around room.

That's a massive room you need more than a tiny subwoofer, a couple of decent 10"/12" sealed boxes should be enough for music

So use Non-boost mode? I can try this. Roomfit used to work differently, I'll mess with it some more.

Only options are to move the sub left and right under the TV shelf, I have tried maybe 8 positions in the small space under the TV and same results, so I just moved it back to the middle.

So power off the speakers and see if the sub has more power. worth a try.

in the past, when I changed the sub polarity (and latency for that polarity) that would make a big difference, now the same...

as far as the bass, this woofer is fine in this space, just not sure what happend

Thank you

Wiimer · 2025-09-13T09:40:26-0700

khuntim said:
So use Non-boost mode? I can try this. Roomfit used to work differently, I'll mess with it some more.

Only options are to move the sub left and right under the TV shelf, I have tried maybe 8 positions in the small space under the TV and same results, so I just moved it back to the middle.

So power off the speakers and see if the sub has more power. worth a try.

in the past, when I changed the sub polarity (and latency for that polarity) that would make a big difference, now the same...

as far as the bass, this woofer is fine in this space, just not sure what happend

Thank you

Out of curiosity, does closing the bedroom door make a difference to the measurement results?

rccarguy · 2025-09-13T09:41:31-0700

Correct use non boost mode, boosting uses lots more power. You only want to apply cuts

Need raw response of the sub and raw response of the speakers, so you can see what it's like. If it changes, and speakers & sub response change then crossover isn't right

That massive dip at 60hz could sub and speakers cancelling each other out.

Correct, close windows and doors. That will effect bass response.

Machiavelli · 2025-09-13T09:43:28-0700

Wiimer said:
Out of curiosity, does closing the bedroom door make a difference to the measurement results?

could be. dependent on how good the sex is

Wiimer · 2025-09-13T09:47:52-0700

Machiavelli said:
could be. dependent on how good the sex is

Should I now exercise my curatorial powers and delete your post?

Machiavelli · 2025-09-13T09:50:09-0700

feel free to do whatever you want

rccarguy · 2025-09-13T09:52:56-0700

use REW room sim to get an idea where best location of the sub should be,

Basically need something like this, this is for speaker but principle is the same, how it interacts between the crossover point and over the range

If you imagine the subwoofer is the blue line, green is the speakers. Only one active during testing.

Then plot another response with both switched on. Compare the individual sub and speaker responses, to the combined response It should look similar, but flatter with both of them on.

dominikz · 2025-09-13T13:13:26-0700

khuntim said:
I am not sure what changed, I used to be able to get different results with RoomFit just by changing the Sub from 0° to 180°, now regardless of sub position, sub polarity or crossover, always looks like this.

if I boost by 3db or so in the Sub settings it doesn't sound right. hoping to get back to something a bit closer with a bit of sub impact.

Speakers are Shanling S0 50hz-20khz, Sub is REL Tzero mkiii 37hz-? Crossover at 60hz. LFE input on sub. RoomFit 30-400hz. Using optical input, have tried USB and AUX.

The sub will not fit behind the TV, unless I figure out a different stand of some sort. floor and walls are concrete. I tried pulling the sub out a bit, can't have it in the walkway, that did nothing..

sub latency tested using all speaker inputs with the Ultra in listening position, Sub always leads the speakers by at least 3ms, up to 40ms using USB.

Microphone is Umik1 using iPad.

Ultra was factory reset after latest firmware.

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As a first experiment I'd suggest just increasing the sub crossover frequency in WHA to 100Hz and see if that fixes/changes the dip after re-running RoomFit. Remember to disable MMM so you get the Individual Channel RoomFit option.

khuntim · 2025-09-13T16:41:25-0700

dominikz said:
As a first experiment I'd suggest just increasing the sub crossover frequency in WHA to 100Hz and see if that fixes/changes the dip after re-running RoomFit. Remember to disable MMM so you get the Individual Channel RoomFit option.

I tried 100hz, and quite a few others and came up the same, will have to try again. I was wondering how I lost the left/right option, thanks

khuntim · 2025-09-13T16:43:21-0700

rccarguy said:
use REW room sim to get an idea where best location of the sub should be,

I'll have to try REW again, pretty lost with this software.

khuntim · 2025-09-13T16:54:02-0700

Wiimer said:
Out of curiosity, does closing the bedroom door make a difference to the measurement results?

I can try, didn't want my 6.5" sub to feel worse than he does already.

Sub help

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